Shilling Telegraph

Shilling Telegraph

 

an electromagnetic telegraph that was invented by P. L. Shilling in 1832. In the Shilling telegraph, current pulses—that is, telegraph code units—were formed by opening and closing a battery circuit by means of contact keys. Either an equal-length code or an unequal-length code was used for transmission; both types of code were developed by Shilling. The receiver was a type of moving-magnet magnetometer called a multiplier, that is, a device that contained a magnetized needle and a signal disk, both of which were suspended from a wire near a solenoid. Telegraph signals were indicated by the orientation of the needle in the solenoid field.